Tile arch structure



June 5 P. w. ANTILZL 2,600,460

TILE ARCH STRUCTURE Filed Nov. 12, 1948 Patented June 17, 1952 UNITED STATES T OFFICE TILE ARCH STRUCTURE Philip W. Antill, Ridgefield Park, N. J assignor to M. H. Detrick Company, Chicago, 111., a, corporation of Delaware 4 Claims. 1

This invention relates to arch structures for industrial furnaces, particularly open hearth furnaces, in which the refractory materials are subjected to intense heat above the melting temperatures of steel, and it is among the objects thereof to provide a tile structure for furnace roofs in which the ends of the roof employ skewback castings for retaining standard shape tile as distinguished from special shape skew-back structures requiring special refractory shapes.

It is a further object of the invention to provide an arch construction in which the end tile cooperate with the walls of the furnace in a manner to eliminate the burning out of the tile as frequently occurs in conventional construction.

It is still a further object of the invention to provide an arch structure of skew-back retaining means and tile which may be sprung to permit expansion and contraction of the tile.

These and other objects of the invention will become more apparent from a consideration of the accompanying drawing, constituting a part hereof, in which like reference characters designate like parts, and in which Fig. 1 is a vertical cross-sectional view, partially in elevation, of a portion of an open hearth furnace embodying the principles of this invention; and

Fig. 2 is a similar view taken at right angles to the View of Fig. 1.

In the drawing the numeral I generally designates the roof of an open hearth furnace consisting of tapered tile '2 which are suspended by hangers 3 from curved rods 4 that in turn are suspended by links 5 from I-beams 6 mounted transversely of I-beams I that are supported on the buckstays 8 disposed around the outside of the furnace, links 5 being resiliently mounted by springs 9 as shown in Fig. 2. The arch construction is such that it may expand and contract With temperature conditions in the furnace without separation of the tile, which is Well known in the art and constitutes no part of the present invention.

Because of the difference in temperature of the inner wall Iii of the arch, which is exposed to the intense heat of the furnace, and the colder outer wall H of the arch, there is a tendency for the ends of the arch to move on the upright walls 8 and the amount of expansion or contraction would be greater on the bottom of the arch tile 2 than at the top thereof.

In conventional practice special shaped skewback tile has been employed on the ends of the arch, which requires stocking of a large number of different shaped refractory pieces for replacement purposes. In accordance with the present invention, such special forms of refractory are eliminated and standard refractory brick l2 and it may be employed by utilizing a special shaped skew-back casting M which is of zigzaz form, as shown in Fig. l of the drawing.

By virtue of the zigzag shape of the skew-back, the end refractory brick [3 projects beyond the lower face if! of the arch into a sand seal which may be ganister, such as chrome ore or the like, designated by thereference character 15. This construction prevents the products of combustion from passing through the wall and seals off the arch while permitting relative movement of the arch tile to the wall, the sand seal being such as to prevent a straight line passage of the products through the seal of the wall, and the end brick I 3 extending into the sand seal prevents burning out of the skew-back casting [4.

The skew-back casting may be yieldingly restrained against movement by a lever l6 pivotally mounted at l? and biased by a spring [8, the end of the lever It being shaped complementary to the zigzag shape of the skew-back id for effecting abutting engagement therewith over a relatively large area. The lever l6 may be adjusted by providing perforations H) as shown.

Other features of the furnace need not be described as the present invention deals primarily with the special shaped skew-back which permits the use of standard refractory brick in furnace arch structures, that provides a shiplap seal and protects the skew-back casting from the intense heat of the furnace.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

I claim:

1. In a tile arch structure for industrial heating furnaces, a skew-back roof tile support comprising a plate of zigzag shape in cross section in a vertical plane diametrically through the arch having the upper face thereof abutting the end tile of the arch and having the bottom face supported independently of the arch, and refractory brick disposed intermediate the upper and bottom end faces of the skew-back to constitute a refractory lining for the skew-back plate.

2. In an industrial heating furnace having a tile arch roof, a skew-back roof tile support comprising a plate of zigzag shape in cross section in a vertical plane diametrically through the arch having a face thereof abutting the end tile 0f the arch and having the bottom face supported on a wall of the furnace, and refractory brick disposed intermediate the upper and bottom end faces of the skew-back in the zigzag faces thereof to constitute refractory surfaces intermediate the furnace chamber and the skew back plate, one of said refractory brick extending downward beneath the lower face of the arch and skew-back to constitute a sealing means between the arch and supporting Wall.

3. In an industrial heating furnace, a roof comprising a plurality of tapered tile with their faces abutting to constitute a continuous arch, a skew-back plate supporting the ends of the arch of zigzag shape in cross section in a vertical plane diametrically through the arch with the upper face of the plate abutting the end tile of the arch and the bottom face resting on a wall of the furmace, and refractory brick disposed in the zigzag shoulders of the skew-back abutting the shoulders and off-set faces thereof on the side of the furnace chamber, said brick constituting a continuation of the arch.

4. The combination with a furnace Wall of a refractory arch supported thereon, said wall hav- 4 ing a recess for receiving ganister, means for yieldingly supporting the end of the arch on said wall comprising a skew-back casting of zigzag shape in cross section in a vertical plane diametrically through the arch having the bottom face resting on the Wall and having its upper face engaging the end face of the arch tile, refractory brick disposed between the end tile of the arch and the skew-back in the recesses formed by the zig zag shape to constitute an extension of the arch, one of said brick extending downward into the recess of the wall to constitute a seal with the ganister disposed between the wall and arch.

PHILIP W. ANTILL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,330,052 Bonsor Feb. 10, 1920 1,757,682 Palm May 6, 1939 2,023,174 Hofmann Dec. 3, 1935 2,200,372 Linder May 14, 1940 2,299,102 McLimans Oct. 29, 1942 

